会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 143. 发明授权
    • Audio signal coding apparatus, audio signal decoding apparatus, and audio signal coding and decoding apparatus
    • 音频信号编码装置,音频信号解码装置和音频信号编码和解码装置
    • US06871106B1
    • 2005-03-22
    • US09266631
    • 1999-03-11
    • Tomokazu IshikawaMineo TsushimaTakeshi Norimatsu
    • Tomokazu IshikawaMineo TsushimaTakeshi Norimatsu
    • G10L19/02G06F17/00
    • G10L19/0212
    • An audio signal coding apparatus includes a first-stage encoder for quantizing the time-to-frequency transformed audio signal and second-and-subsequent-stages of encoders each for quantizing a quantization error output from the previous-stage encoder A characteristic decision unit is provided which decides the frequency band of an audio signal to be quantized by each encoder of multiple-stage encoders, and a coding band control unit receives the frequency band decided by the characteristic decision unit and the time-to-frequency transformed audio signal, decides the order of connecting the respective encoders, and transforms the quantization bands of the encoders and the connecting order to code sequences. Therefore, it is possible to provide an audio signal coding apparatus performing adaptive scalable coding, which exhibits sufficient performance when coding various audio signals.
    • 音频信号编码装置包括用于量化时间 - 频率变换的音频信号的第一级编码器和用于量化前级编码器特性判定单元输出的量化误差的编码器的第二级和后级级 由编码频带控制单元接收由特性判定单元和时间 - 频率变换音频信号决定的频带,决定由多级编码器的各编码器量化的音频信号的频带, 连接各编码器的顺序,将编码器的量化频带和连接顺序转换为编码序列。 因此,可以提供执行自适应可伸缩编码的音频信号编码装置,其在对各种音频信号进行编码时表现出足够的性能。
    • 146. 发明授权
    • Audio signal compression method, audio signal compression apparatus, speech signal compression method, speech signal compression apparatus, speech recognition method, and speech recognition apparatus
    • 音频信号压缩方法,音频信号压缩装置,语音信号压缩方法,语音信号压缩装置,语音识别方法和语音识别装置
    • US06477490B2
    • 2002-11-05
    • US09892745
    • 2001-06-28
    • Yoshihisa NakatohTakeshi NorimatsuMineo TsushimaTomokazu IshikawaMitsuhiko SerikawaTaro KatayamaJunichi NakahashiYoriko Yagi
    • Yoshihisa NakatohTakeshi NorimatsuMineo TsushimaTomokazu IshikawaMitsuhiko SerikawaTaro KatayamaJunichi NakahashiYoriko Yagi
    • G10L1906
    • H04B1/665G10L2019/0005
    • An audio signal compression apparatus for compressively coding an input audio signal comprises a time-to-frequency transformation unit for transforming the input audio signal to a frequency domain signal; a spectrum envelope calculation unit for calculating a spectrum envelope having different resolutions for different frequencies, from the input audio signal, using a weighting function on frequency based on human auditory characteristics; a normalization unit for normalizing the frequency domain signal using the spectrum envelope to obtain a residual signal; a power normalization unit for normalizing the residual signal by the power; an auditory weighting calculation unit for calculating weighting coefficients on frequency, based on the spectrum of the input audio signal and human auditory characteristics; and a multi-stage quantization device having plural stages of vector quantizers connected in series, to which the normalized residual signal is input, and at least one of the vector quantizers quantizing the residual signal using the weighting coefficients. Therefore, a low frequency band, which is auditively important, can be analyzed with a higher frequency resolution as compared with a high frequency band, whereby efficient signal compression utilizing human auditory characteristics is realized.
    • 一种用于对输入音频信号进行压缩编码的音频信号压缩装置包括用于将输入音频信号变换为频域信号的时间 - 频率变换单元; 频谱包络计算单元,用于根据输入的音频信号,使用基于人的听觉特征的频率的加权函数来计算用于不同频率的不同分辨率的频谱包络; 归一化单元,用于使用频谱包络对频域信号进行归一化以获得残余信号; 功率归一化单元,用于通过所述功率归一化所述残余信号; 听觉加权计算单元,用于基于输入音频信号的频谱和人类听觉特征来计算频率上的加权系数; 以及具有串联连接的多级矢量量化器的多级量化装置,其中输入归一化残差信号,以及使用加权系数量化残差信号的矢量量化器中的至少一个。 因此,与高频带相比,可以以更高的频率分辨率来分析具有重要意义的低频带,从而实现利用人类听觉特性的有效信号压缩。
    • 147. 发明授权
    • Speech recognition method and apparatus using frequency warping of linear prediction coefficients
    • 使用线性预测系数的频率变形的语音识别方法和装置
    • US06311153B1
    • 2001-10-30
    • US09165297
    • 1998-10-02
    • Yoshihisa NakatohTakeshi NorimatsuMineo TsushimaTomokazu IshikawaMitsuhiko SerikawaTaro KatayamaJunichi NakahashiYoriko Yagi
    • Yoshihisa NakatohTakeshi NorimatsuMineo TsushimaTomokazu IshikawaMitsuhiko SerikawaTaro KatayamaJunichi NakahashiYoriko Yagi
    • G01L2100
    • H04B1/665G10L2019/0005
    • An audio signal compression apparatus for compressively coding an input audio signal comprises a time-to-frequency transformation unit for transforming the input audio signal to a frequency domain signal; a spectrum envelope calculation unit for calculating a spectrum envelope having different resolutions for different frequencies, from the input audio signal, using a weighting function on frequency based on human auditory characteristics; a normalization unit for normalizing the frequency domain signal using the spectrum envelope to obtain a residual signal; a power normalization unit for normalizing the residual signal by the power; an auditory weighting calculation unit for calculating weighting coefficients on frequency, based on the spectrum of the input audio signal and human auditory characteristics; and a multi-stage quantization device having plural stages of vector quantizers connected in series, to which the normalized residual signal is input, and at least one of the vector quantizers quantizing the residual signal using the weighting coefficients. Therefore, a low frequency band, which is auditively important, can be analyzed with a higher frequency resolution as compared with a high frequency band, whereby efficient signal compression utilizing human auditory characteristics is realized.
    • 一种用于对输入音频信号进行压缩编码的音频信号压缩装置包括用于将输入音频信号变换为频域信号的时间 - 频率变换单元; 频谱包络计算单元,用于根据输入的音频信号,使用基于人的听觉特征的频率的加权函数来计算用于不同频率的不同分辨率的频谱包络; 归一化单元,用于使用频谱包络对频域信号进行归一化以获得残余信号; 功率归一化单元,用于通过所述功率归一化所述残余信号; 听觉加权计算单元,用于基于输入音频信号的频谱和人类听觉特征来计算频率上的加权系数; 以及具有串联连接的多级矢量量化器的多级量化装置,其中输入归一化残差信号,以及使用加权系数量化残差信号的矢量量化器中的至少一个。 因此,与高频带相比,可以以更高的频率分辨率来分析具有重要意义的低频带,从而实现利用人类听觉特性的有效信号压缩。